Derrick.



$10,628,815. Patented July ll, I899.

C. W. KEARNS.

DERRICK.

(A pl cation filed June 11, 1898.) (No Model.) 3 Sheets-Sheet 2.

1522622 Zarx v i QWZwJZC/arwJ,

' Patented July ll, I899. G. W. KEABNS. 1

DERRICK (Application filed June 11, 1898.)

3 Sheets-Sheet 3.

(NojlodeL) flV/ZZQ aariwmrmy,

Ilrrnn CHARLES IV. KEARNS OF CHICAGO, ILLINOIS.

DERRICK.

SPECIFICATION forming part of Letters IPatent No. 628,815, dated July11, 1899.

Application filed June 11,1898. Serial No. 683,222. (Nomodel-l To allwhom it may concern:

Be it known that 1, CHARLES WI KEARNS, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Derricks, of which thefollowing is a specification.

My invention relates to that class of derricks which are arranged foruse with a prime mover in the shape of a steam-engine, and particularlyto that class of derricks known as turn-table derricks, and has for itsobject the providing of a simple, economical, and efficient turn-tablederrick.

The invention consists in the features, combinations, and details ofconstruction hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side elevation of a derrickconstructed in accordance with my improvements; Fig. 2, a plan view ofthe same with the mast, boom, and some other parts removed; Fig. 3, aplan view of the supporting-platform upon which the turntable rests;Fig. 4, a sectional elevation taken on the line 4- of Fig. 3; and Fig.5, a diagrammatic view of the means for swinging the turn-table.

In the art to which this invention relates it is well known that theturn-table derricks now in use are constructed largely of metal beamsand castings, and as a consequence when any of such parts become worn orbroken it is necessary to send them to the factory for shop repairs.This is a serious objection in that it involves considerable expense, aswell as loss of time, which may be a most important factor in thatcontractors are often required to finish their Work at or before astated time.

The principal object of my invention, therefore, is to remove theseobjections and to provide a simple, economical, and efficient turntablederrick which may be constructed of or repaired with ordinary commercialwood timber, such as is found in any lumber-yard and such as may be keptin stock without any large expenditure of money.

Further objects of the invention will appear from an examination of thedrawings and'the following description and claims.

In constructing a derrick in accordance 0nd yoke 1-1 with myimprovements I make a supportingplatform A and form it of twolongitudinal supporting-timbers a and co, upon which the transversefloor-boards a are laid, the whole forming a structure in theshape of askid. This supporting-platform is adapted to run on tracks or ways A bymeans of the cylindrical rolls A which are interposed between theplatform and the ways, so that the platform may be moved backwardly andforwardly as seems desirable or necessary.

For the purpose of supporting the turntable I provide the platform witha circular track B, formed, preferably, of the ordinary railway-rail,which, as is well known, in cross-section shows a channel on each sideformed by the head and web flange portion. Upon this circular track theturn-table C is supported, as shown particularly in Figs. 1. and 2, andhas its pivotal point in the platform at c at or near the geometricalcenter of the track, as shown particularly in Fig. 3. To the turntableis secured the mast D and the boom E, both of which are formed ofordinary commercial wood timber. The boom, as is well known, is used tosupport and move the load to or from the center of the turntable. Uponthe platform is also secured in an y suitable manner ahoisting-engineGr, having three drums g, and g all of which will be more fullyhereinafter described.

In order to swing the turn-table, with its load, so as to carry it fromone place to another, I provide a cable or similar element H and pass itaround the drum 9 This cable is then passed over the sheave-pulleys h hh and down through the structure and around the track B and in theoutside channel thereof, as shown particularly in Fig. 4, and thencearound the idler-roll h one end being secured to the platform by meansof the yoke H. A second portion of the cable is passed around thesheave-pulleys h k h, thence around the outside channel in the track,down through the platform, and around the idlerpulley 71 and has its end7L7 secured to .a sec- It will be seen from this arrangement that whenthe engine is operated so as to rotate the drum g in one direction oneportion of the turn-table cable is wound up and the other unwound, so asto rotate the table in one direction. An opposite rotation of the drum gwill swing or rotate the turntable in the opposite direction.

It is often desirable and necessary to bring the load nearer to thetrack or move it over from the track, and in order to accomplish thisresult it is necessary to raise or lower the boom. In order to do this,a cable I is provided, one end of which is secured to the drum g, fromwhence it is allowed to pass through a pulley-block t', which is securedto the outer end of the boom, thence around and through a pulley-blockt, which is secured to the upper end of the mast, then again around thepulley t', and back to the pulley t", to the block of which it issecured, so that as the boom-cable is wound up the boom is raised and assuch cable is unwound the boom is permitted to fall.

In order to raise and lower the load when it is desirable or necessary,a third cable K is provided, one end of which is passed around the drum9 from whence it is passed through an idler-pulley 7c, secured at anydesirable location on the boom, thence over a second idler-pulley 7r, ator near the upperend of the pulley, and through the block and tackle K,of which it forms a part and which is secured at to the upper end of theboom. It will thus be seen that when this drum g is operated the cableis either wound up or released, and as acons'equence the load is eitherraised or lowered.

g It is oftentimes desirable to shift the position of the derrick, andin order to do so a cable L is provided, one end of which may be securedto a stake driven in the ground at a point X and the other end passedaround a nigger-head Z on one of the drums, as shown particularly inFig. 2. By winding up the cable on this nigger-head the derrick may bemoved on its skids to the desired position.

From the foregoingdescription of construction and operation it will be.seen that the parts are constructed of ordinary commercial timbers, andwhen one becomes worn, de-

A further advantage, which is a material one,

is that the derrick may be taken apart and easily shipped to a desiredpoint, Where it can be again erected and put in position with theassistance of an ordinary carpenter.

I claim 1. In mechanisms of the class described, the combination of asupporting-platform, a circular track arranged thereon, a turn-tablemounted on the circular track, a hoistingengine on the turn-table, and acable cord or similar element connected to such engine and rove aroundthe circular track and the ends thereof so secured to thesupporting-platforms as to secure a complete rotation of the turn-table,substantially as described.

2. In mechanisms of the class described, the combination of asupporting-platform formed of timbers arranged longitudinally with thefloor portion laid thereon and transversely thereof so as to form askid, a circular track formed of a railway-rail arranged on thesupporting-platform, a turn-table mounted on such track having itspivotal point at the central portion thereof, a hoisting-engine on suchturn-table, and a cable cord or similar element secured to a drum on thehoistingengine and passed around the outer channel in the circular trackhaving its ends so secured to the supporting-platform as to secure acomplete rotation of the turn-table, substantially as described.

3. In mechanisms of the class described, the combination ofasupporting-platform formed of wood timbers, a circular track formed ofa railway rail or rails laid thereon, a turntable mounted on suchcircular track and having its pivotal point at or near the centerthereof, ahoisting-engine on such turn-table, a mast secured to suchturn-table and formed of wood timber, a boom pivotally connected to theturn-table so as to have its outer end raised or lowered, and cablemechanism attached to the hoisting-engine and secured to the boom 'so asto raise and lower the same and also passed around the circular trackand the ends thereof so secured to the platform as to secure a completerotation of the turn-table, substantially as described.

4. In mechanisms of the class described, the combination of asupporting-platform formed of wooden timbers, a circular track formed ofa railway rail or rails laid thereon, a turntable mounted on suchcircular track and having its pivotal point at or near the centerthereof, a hoisting-engine on such turntable, a cable cord or similarelement secured to a drum on the hoisting-engine and passed around theouter channel in the circular track having its ends so secured to thesupporting-platform as to secure a complete r0- tation of suchturn-table, a mast secured to such-turn-table and formed of wood timber,a boom pivotally connected to the turn-table so as to have its outer endraised or lowered,

track and having pivotal connection with the platform at or near thecenter of the track, a mast formed of wood timber secured to theplatform, a boom formed of wood timber pivotally secured to the platformso as to permit the raising and lowering of its outer end, ablock-and-tackle mechanism secured to the outer end of the boom to raiseand lower a load, a hoisting-engine on such turn-table provided withthree winding-drums, a cable connected to one of such winding-drumspassed around the channel in the circular track and having its ends sosecured to the supporting-platform as to secure a complete rotation ofthe turn-table, a cable connected :5

mechanism to raise and lower a load, sub- 26 stantially as described.

CHARLES W. KEARNS.

\Vitnesses:

EPHRAIM BANNING, THOMAS B. McGREGoR.

